Massachusetts officials are using hi-tech tags to track the movements of two great white sharks near Cape Cod – the first time they have ever been tagged in the Atlantic. The electronic tags use satellite technology to record the travels of the sharks, allowing scientists to better understand their migratory patterns. The sharks were spotted on Saturday by scientists investigating sightings off Monomoy island near Chatham, and were tagged using a harpoon. Sharks are common in Cape waters during summer, though great white sharks are relatively rare around New England.